虽然我已经更新了Android Studio版本，但它不会改变

I tried to update my android studio from 1.5.1 to 2.2.2. While i have finished my update and open android studio the versions not changed and still 1.5.1 version. Why this happen and what is the solution. Sorry for my english. Thank youI tried to update my android studio from 1.5.1